Samba - Multiple AD groups authentication

[davix12]

I've joined my samba server with microsoft Active directory to authenticate AD group to use Squid proxy.
In this way all works fine:

auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp --require-membership-of="MYDOMAIN+group1"

But I need to authenticate TWO AD groups. How can I do it?

Can multiple global groups be designated as arguments to 'require-membership-of'?

Thanks