Must I call Sync for a child logger?

[yizhixiaotaozi]

I would call rootLogger.Sync() using defer way in main.go.
childLogger := rootLogger.With({"xx":"xx"}), Should I call childLogger.Sync() too?
I hope its' unnessary。

[yizhixiaotaozi]

func (log *Logger) Sync() error {
	return log.core.Sync()
}

func (log *Logger) clone() *Logger {
	copy := *log
	return &copy
}

I see rootLogger.Sync() call the same core in source code, its' unnessary to call childLogger.Sync().