code: func (p *prefixTrie) ContainingNetworks(ip net.IP) ([]RangerEntry, error) {
  	nn := rnet.NewNetworkNumber(ip)
  	if nn == nil {
  		return nil, ErrInvalidNetworkNumberInput
  	}
  	return p.containingNetworks(nn)
  }
docs: // ContainingNetworks returns the list of RangerEntry(s) the given ip is
  // contained in in ascending prefix order.