code: func (b *bruteRanger) CoveredNetworks(network net.IPNet) ([]RangerEntry, error) {
  	entries, err := b.getEntriesByVersion(network.IP)
  	if err != nil {
  		return nil, err
  	}
  	var results []RangerEntry
  	testNetwork := rnet.NewNetwork(network)
  	for _, entry := range entries {
  		entryNetwork := rnet.NewNetwork(entry.Network())
  		if testNetwork.Covers(entryNetwork) {
  			results = append(results, entry)
  		}
  	}
  	return results, nil
  }
docs: // CoveredNetworks returns the list of RangerEntry(s) the given ipnet
  // covers.  That is, the networks that are completely subsumed by the
  // specified network.