How to filter group membership from the ldap server?

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http://unix.stackexchange.com – Context : We have a Ubuntu 12.04 with authentication done on a ldap server. Unfortunately, one (ldap) user belongs to a (ldap) group named "admin". I know there is the option nss_initgroups_ignoreusers to list the users I don't want to be looked for from the ldap. But couldn't find any equivalent for groups. How could I specify ldap groups not to be used on this installation? (HowTos)