The issue is solved but i still have some concerns about the use of ACLs.
Basically ACLs should be used only to handle very special cases, but I see that many Windows system administrators are used to always set the ACL over shared folder.
I was wondering: should we add a clarification inside the administrator manual with a usage scenario?
( Relevant page: http://docs.nethserver.org/en/v7rc/shared_folder.html )