code: func IsAbs(path string) bool {
  	if !filepath.IsAbs(path) {
  		if !strings.HasPrefix(path, string(os.PathSeparator)) {
  			return false
  		}
  	}
  	return true
  }
docs: // IsAbs is a platform-specific wrapper for filepath.IsAbs. On Windows,
  // golang filepath.IsAbs does not consider a path \windows\system32 as absolute
  // as it doesn't start with a drive-letter/colon combination. However, in
  // docker we need to verify things such as WORKDIR /windows/system32 in
  // a Dockerfile (which gets translated to \windows\system32 when being processed
  // by the daemon. This SHOULD be treated as absolute from a docker processing
  // perspective.