SquidGuard Ldap search group

[slevi]

How to create a group ACL in SquidGurad where Client (source)  is group of LDAP?
I think it is Ldap search but what is the correct syntax?

SquidGurad reports:
IP: 192.168.0.1 - Subnet: 192.168.0.0/24 or 192.168.1.0/255.255.255.0 - IP-Range: 192.168.1.1-192.168.1.10
Domain: foo.bar matches foo.bar or *.foo.bar
Username: 'user1'
ldapusersearch ldap://192.168.0.100/DC=domain,DC=com?sAMAccountName?sub?(&(sAMAccountName=%s)(memberOf=CN=it%2cCN=Users%2cDC=domain%2cDC=com))

mydomain: prova.loc
LDAP group: users1