code: func excludeByIsolation(container *container.Snapshot, ctx *listContext) iterationAction {
  	i := strings.ToLower(string(container.HostConfig.Isolation))
  	if i == "" {
  		i = "default"
  	}
  	if !ctx.filters.Match("isolation", i) {
  		return excludeContainer
  	}
  	return includeContainer
  }
docs: // excludeByIsolation is a platform specific helper function to support PS
  // filtering by Isolation. This is a Windows-only concept, so is a no-op on Unix.