code: func NewHandle(nlFamilies ...int) (*Handle, error) {
  	return newHandle(netns.None(), netns.None(), nlFamilies...)
  }
docs: // NewHandle returns a netlink handle on the current network namespace.
  // Caller may specify the netlink families the handle should support.
  // If no families are specified, all the families the netlink package
  // supports will be automatically added.