Getting rights assigned to a user by (sub)groups

Hi,

 

I have returned to the development of my app and I stumbled across a
problem. =/

 

I have situation where I have two groups A and B. 

 

A is parent to B. 

A has no rights assigned to it but B does. 

 

Hence I would like to get all the grouprights assigned to the user with
regard to the user perm_user_id. How should the params-array sent to
$admin->perm->getRights($params); look like? 

 

THANKS in advance,

Regards,

Jan Bolmeson