### Please describe the problem.
Got an error message trying to initialize a git-annex repo on a VirtualBox shared folder (Linux guest, Windows host).  The shared folder is on an external USB drive.

### What steps will reproduce the problem?
See log

### What version of git-annex are you using? On what operating system?

[[!format sh """
(newer3-gdrive-remote-env) [ilya@cg-router1 WPAE9-305]$ git annex version
git-annex version: 8.20200617-g02765b8
build flags: Assistant Webapp Pairing S3 WebDAV Inotify DBus DesktopNotify TorrentParser MagicMime Feeds Testsuite
dependency versions: aws-0.22 bloomfilter-2.0.1.0 cryptonite-0.25 DAV-1.3.4 feed-1.2.0.1 ghc-8.6.5 http-client-0.6.4 persistent-sqlite-2.9.3 torrent-10000.1.1 uuid-1.3.13 yesod-1.6.0.1
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 BLAKE2B256E BLAKE2B256 BLAKE2B512E BLAKE2B512 BLAKE2B160E BLAKE2B160 BLAKE2B224E BLAKE2B224 BLAKE2B384E BLAKE2B384 BLAKE2BP512E BLAKE2BP512 BLAKE2S256E BLAKE2S256 BLAKE2S160E BLAKE2S160 BLAKE2S224E BLAKE2S224 BLAKE2SP256E BLAKE2SP256 BLAKE2SP224E BLAKE2SP224 SHA1E SHA1 MD5E MD5 WORM URL
remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs hook external
operating system: linux x86_64
supported repository versions: 8
upgrade supported from repository versions: 0 1 2 3 4 5 6 7
local repository version: 8
(newer3-gdrive-remote-env) [ilya@cg-router1 WPAE9-305]$ uname -a
Linux cg-router1.broadinstitute.org 3.10.0-1127.13.1.el7.x86_64 #1 SMP Tue Jun 23 15:46:38 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
(newer3-gdrive-remote-env) [ilya@cg-router1 WPAE9-305]$ 
"""]]

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log
(newer3-gdrive-remote-env) [ilya@cg-router1 WPAE9-305]$ git init
Initialized empty Git repository in /mnt/shared/d/WindowsImageBackup/WPAE9-305/.git/
(newer3-gdrive-remote-env) [ilya@cg-router1 WPAE9-305]$ git annex init 'blue wd passport ultra'
init blue wd passport ultra 
  Detected a filesystem without fifo support.

  Disabling ssh connection caching.

  Detected a crippled filesystem.
(scanning for unlocked files...)

  Entering an adjusted branch where files are unlocked as this filesystem does not support locked files.

Switched to branch 'adjusted/master(unlocked)'
ok
(recording state in git...)
git-annex: .git/annex/othertmp/jlog12400-5: removeLink: resource busy (Text file busy)
(newer3-gdrive-remote-env) [ilya@cg-router1 WPAE9-305]$ 


# End of transcript or log.
"""]]

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

Certainly.  Right now trying to organize a new set of backups from multiple places, which without git-annex would be an organizational nightmare.

> Closing this because the FS seems too buggy to try to support.
> [[done]] --[[Joey]]
