[Samba] Wrong owner file for the admin group

[Gustavo Ceresoli]

Hi, when I use the parameter "domain admin group = @admin" in my smb.conf, 
anyone user for the group admin create a file (in your home, or profile, or any 
resource) and the owner for this file is root.

I would wish that the owner is the real user instead of root.

I tried using the parameter force user=%U but don work.

Somebody can help me?

Thank