It is evident that you don’t need to do the same tests than me, specially on a production server, but when I change the owner to Apache, I still can write in the folder after with samba.
All files and folders keeps the same ownership (apache/Samba_Owner_Group)
# ll -R /var/lib/nethserver/ibay/
drwxrwsr-x+ 8 apache yuyu 4096 Dec 27 08:42 tutu
drwxrwsr-x+ 2 apache yuyu 4096 Dec 27 08:42 sambacreation
-rw-rw-r--+ 1 apache yuyu 0 Jan 28 2015 Nouveau NewFile
I noticed something interesting, probably a bug, a user created before the installation of nethserver-samba cannot reach a samba share, even if you go to the panel for allowing this user to the samba shares after the samba installation…I needed to create a new user and set him a password.