code: func (b *bruteRanger) Contains(ip net.IP) (bool, error) {
  	entries, err := b.getEntriesByVersion(ip)
  	if err != nil {
  		return false, err
  	}
  	for _, entry := range entries {
  		network := entry.Network()
  		if network.Contains(ip) {
  			return true, nil
  		}
  	}
  	return false, nil
  }
docs: // Contains returns bool indicating whether given ip is contained by any
  // network in ranger.