code: func (gce *Cloud) ScrubDNS(nameservers, searches []string) (nsOut, srchOut []string) {
  	// GCE has too many search paths by default. Filter the ones we know are useless.
  	for _, s := range searches {
  		if !uselessDNSSearchRE.MatchString(s) {
  			srchOut = append(srchOut, s)
  		}
  	}
  	return nameservers, srchOut
  }
docs: // ScrubDNS filters DNS settings for pods.