### Please describe the problem.

ATM I am chasing a problem that somehow one key "mutated" although I do not remember doing anything malicious, file seems to be also not  writable (itself).
So I decided to fsck, and only spotted a problem when some warnings started to appear that I am not the owner of the (key)file.  So I looked inside and found
that all key dirs are writeable BUT annex complains only about the ones where it can't change permissions since they don't belong to me


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

6.20170815+gitg22da64d0f-1~ndall+1

### Please provide any additional information below.

[[!format sh """
$> for f in sub00{1,3}/anatomy/highres001.nii.gz; do ls -ld $(realpath $f | xargs dirname ); git annex fsck $f; done 
drwxrws--- 2 yoh famface 3 May 12 15:15 /data/famface/openfmri/data/.git/annex/objects/08/V3/SHA256E-s6498717--b850ac82ec9db2d399962609e9381d9c2bdf1f426012500b7005b173ea4d9102.nii.gz/
fsck sub001/anatomy/highres001.nii.gz (checksum...) ok
(recording state in git...)
drwxrwsr-x 2 contematto famface 3 Jul 13  2015 /data/famface/openfmri/data/.git/annex/objects/x2/xX/SHA256E-s6592524--dccba651dc4cd104826a05a2efb6a257b39ca2d8b44d215027250221729f9434.nii.gz/
fsck sub003/anatomy/highres001.nii.gz 
  ** Unable to set correct write mode for .git/annex/objects/x2/xX/SHA256E-s6592524--dccba651dc4cd104826a05a2efb6a257b39ca2d8b44d215027250221729f9434.nii.gz/SHA256E-s6592524--dccba651dc4cd104826a05a2efb6a257b39ca2d8b44d215027250221729f9434.nii.gz ; perhaps you don't own that file
(checksum...) ok
(recording state in git...)

# thought to see may be annex would complain then!?
$> chmod a+rwx /data/famface/openfmri/data/.git/annex/objects/08/V3/SHA256E-s6498717--b850ac82ec9db2d399962609e9381d9c2bdf1f426012500b7005b173ea4d9102.nii.gz/

$> for f in sub00{1,3}/anatomy/highres001.nii.gz; do ls -ld $(realpath $f | xargs dirname ); git annex fsck $f; done                                          
drwxrwsrwx 2 yoh famface 3 May 12 15:15 /data/famface/openfmri/data/.git/annex/objects/08/V3/SHA256E-s6498717--b850ac82ec9db2d399962609e9381d9c2bdf1f426012500b7005b173ea4d9102.nii.gz/
fsck sub001/anatomy/highres001.nii.gz (checksum...) ok
(recording state in git...)
drwxrwsr-x 2 contematto famface 3 Jul 13  2015 /data/famface/openfmri/data/.git/annex/objects/x2/xX/SHA256E-s6592524--dccba651dc4cd104826a05a2efb6a257b39ca2d8b44d215027250221729f9434.nii.gz/
fsck sub003/anatomy/highres001.nii.gz 
  ** Unable to set correct write mode for .git/annex/objects/x2/xX/SHA256E-s6592524--dccba651dc4cd104826a05a2efb6a257b39ca2d8b44d215027250221729f9434.nii.gz/SHA256E-s6592524--dccba651dc4cd104826a05a2efb6a257b39ca2d8b44d215027250221729f9434.nii.gz ; perhaps you don't own that file
(checksum...) ok
(recording state in git...)

"""]]

~~btw -- the same wrong permissions on the upper hash directories, and they do not get fixed/complained about at all (that is ok)~~


[[!meta author=yoh]]