ok, i saw that a user is missing. Instead it is present on the zentyal web page. Why?
...
root@dc1:~# getfacl /home/samba/shares/03_IB_PRODUZIONE
getfacl: Removing leading '/' from absolute path names
# file: home/samba/shares/03_IB_PRODUZIONE
# owner: root
# group: adm
user::rwx
user:root:rwx
user:GSVDESIGN\134gferrari:rwx
user:GSVDESIGN\134mfiore:rwx
user:GSVDESIGN\134pdegiorgio:rwx
user:GSVDESIGN\134sdionisi:rwx
user:GSVDESIGN\134mlucconi:rwx
user:GSVDESIGN\134ddiventura:rwx
user:GSVDESIGN\134pdeglieffetti:rwx
user:GSVDESIGN\134dpalmieri:rwx
group::rwx
group:adm:rwx
group:GSVDESIGN\134domain\040admins:rwx
group:GSVDESIGN\134work_ib:rwx
mask::rwx
other::---
default:user::rwx
default:user:root:rwx
default:user:GSVDESIGN\134gferrari:rwx
default:user:GSVDESIGN\134mfiore:rwx
default:user:GSVDESIGN\134pdegiorgio:rwx
default:user:GSVDESIGN\134sdionisi:rwx
default:user:GSVDESIGN\134mlucconi:rwx
default:user:GSVDESIGN\134ddiventura:rwx
default:user:GSVDESIGN\134pdeglieffetti:rwx
default:user:GSVDESIGN\134dpalmieri:rwx
default:group::rwx
default:group:adm:rwx
default:group:GSVDESIGN\134domain\040admins:rwx
default:group:GSVDESIGN\134work_ib:rwx
default:mask::rwx
default:other::---
root@dc1:~# ^C
root@dc1:~#