winbindd and group cache

Hi,

Sometimes I do not see the changes of domain group memberships with "getent group" until I restart winbindd.
Is there a possibility to flush the cache? In smb.conf we set up "winbind cache time = 60".

Winbindd-Version:
Version 3.0.28-0.5-1657-SUSE-CODE10


Thanks


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