code: def get_nested_groups(self, username):
          
  
          response = self._get(self.rest_url + "/user/group/nested",
                               params={"username": username})
  
          if not response.ok:
              return None
  
          return [g['name'] for g in response.json()['groups']]
docs: Retrieve a list of all group names that have <username> as a direct or indirect member.
  
          Args:
              username: The account username.
  
  
          Returns:
              list:
                  A list of strings of group names.