Problem with MASK in samba

[Affuso Giovanni]

Hi all,
I have a little problem with the export of resourse with samba.
I export a directory pubblic but all files o directory made have the with 
autorizzation 755, why?
Thanks for help
PS: my smb.conf
[scambio]
     path = /intranet/almaitalia/server/scambio
     create mask = 0775
     create mode = 0777
     group = almaitalia
     comment = Scambio
     browseable = yes
     public = yes
     writable =  yes
     write list = @almaitalia



Giovanni Affuso
Responsabile E.D.P.
Alma Italia S.r.l.
c.so Vercelli 387, Torino
tel. 0112620388 fax. 0112624308
mailto:giovanni.affuso at almaitalia.it