code: def apply_filters(self, filters):
          
          _configs = self.configs
          _stats = self.stats
          self.configs = {}
          self.stats = {}
          for f in filters:
              if f in _configs:
                  self.configs[f] = _configs[f]
              elif f in _stats:
                  self.stats[f] = _stats[f]
              else:
                  raise NoSuchControlFileError("%s for %s" % (f, self.subsystem.name))
docs: It applies a specified filters. The filters are used to reduce the control groups
          which are accessed by get_confgs, get_stats, and get_defaults methods.