code: func (p *prefixTrie) CoveredNetworks(network net.IPNet) ([]RangerEntry, error) {
  	net := rnet.NewNetwork(network)
  	return p.coveredNetworks(net)
  }
docs: // CoveredNetworks returns the list of RangerEntry(s) the given ipnet
  // covers.  That is, the networks that are completely subsumed by the
  // specified network.