[Samba] Extended ACL stealing ownership on 3.2.7

[Gavin Henry]

Hi all,

After setting permissions on a file. If anyone authorised to open the
file writes to it, the ACL gets deleted and that person becomes the
owner of the file and the group is reset to the default. For example,
whenever a certain user opens and changes a file in the problem folder
he becomes the owner and another gets kicked of the list:

More clearly, lee was the last one to write to this spreadsheet:

getfac example.xls
# file: example.xls
# owner: joe
# group: testgroup
user::rwx
user:graham:r-x
user:julia:r-x
user:lee:rwx
user:paul:r-x
group::r--
mask::rwx
other::r--

How do I keep rwx on all the additional users, as they all aren't part
of the "testgroup" group.

Thanks.