[Samba] samba does not honor set group bit on directories

[Peter Varkoly]

Hi,

I'm using samba 4.6.15 and 4.8.9 as AD server on a lot of openLeap 42.3 
server.

The server have numerous group directories in /home/groups. This 
drirectory will be provided by a share:

[groups]
         comment = Shared directories of groups you are member in.
         path = /home/groups
         inherit permissions = Yes
         inherit acls = Yes
         browseable = Yes
         guest ok = No
         printable = No
         read only = No

On the group directories the set group ID bit is set:

# file: home/groups/WBFRH1.1
# owner: root
# group: <DOMAIN>\134wbfrh1.1
# flags: -s-
user::rwx
group::rwx
group:<DOMAIN>\134wbfrh1.1:rwx
mask::rwx
other::---
default:user::rwx
default:group::rwx
default:group:<DOMAIN>\134wbfrh1.1:rwx
default:mask::rwx
default:other::---

Creating a file in /home/groups/WBFRH1.1 on the server the group is as 
expected WBFRH1.1.

Creating a file via smbclient or from Windows client the group of the 
file is the primary group of the user.

Why is the behavior different?

How can I force that samba honors the linux settings?


Thanks

Peter Varkoly