[Samba] ACL not set from Microsoft

[Matteo Maretto]

Hi.
We set up a samba domain with two DC ver. 4.7.3 and a file server ver. 
4.7.1.
Currently we have a problem setting ACLs from a Microsoft client.
When we set an ACL the client shows the new ACL correctly, but on the 
fileserver the /getfacl/ command shows no changes.

The filesystem is na ext4 with the options 
/rw,acl,user_xattr,usrquota,grpquota./

This is the share configuration:/
/

/[user1]
         path = /opt/samba/fileserver/user1
         admin users = @"domain admins"
         valid users = @"domain users"
         hide unreadable = yes
         hide unwriteable files = no
         hide special files = yes

         directory mask = 2775

         read only = No
         guest ok = Yes
         browseable = Yes
         hide dot files = yes

         use sendfile = yes

         acl group control = yes
         inherit permissions = yes
         inherit acls = yes

         map acl inherit = yes

         store dos attributes = yes

         dos filemode = yes

         vfs objects = readahead acl_xattr full_audit recycle 
default_quota:quotasettings

         quotasettings:  uid nolimit = no
         quotasettings:  gid = 65534
         quotasettings:  gid nolimit = no

         acl_xattr:ignore system acls = yes

         recycle:repository = /opt/samba/fileserver/.recycle/user1
         recycle:directory_mode = 2770
         recycle:versions = True
         recycle:keeptree = True
         recycle:touch = True
         recycle:touch_mtime = False
         #recycle:minsize = 1
         recycle:exclude = *.tmp *.temp ~$* *.~?? *.o *.obj *.swp *~ 
.~lock.*
         recycle:exclude_dir = .recycle ?SharedObjects

         full_audit:prefix = %u|%I|%m|%S
         full_audit:success = mkdir rmdir rename read write unlink chown 
readlink link mknod fset_nt_acl sys_acl_set_file sys_acl_set_fd 
sys_acl_delete_def_file pwrite open

         full_audit:failure = connect
         full_audit:facility = LOCAL4
         full_audit:priority = NOTICE
/

/
/

Can anyone explain this behaviour?
Thanks in advance.

Matteo