code: def _serialize_zebra_family_prefix(prefix):
      
      if ip.valid_ipv4(prefix):
          family = socket.AF_INET  # fixup
          prefix_addr, prefix_num = prefix.split('/')
          return family, struct.pack(
              _ZEBRA_FAMILY_IPV4_PREFIX_FMT,
              family,
              addrconv.ipv4.text_to_bin(prefix_addr),
              int(prefix_num))
      elif ip.valid_ipv6(prefix):
          family = socket.AF_INET6  # fixup
          prefix_addr, prefix_num = prefix.split('/')
          return family, struct.pack(
              _ZEBRA_FAMILY_IPV6_PREFIX_FMT,
              family,
              addrconv.ipv6.text_to_bin(prefix_addr),
              int(prefix_num))
  
      raise ValueError('Invalid prefix: %s' % prefix)
docs: Serializes family and prefix in Zebra format.