在多个sk场景中使用一个SKEmitterNode。

I have a new game I've just started building in sprite kit with swift and I'm wondering how I can use a SKEmitterNode seamlessly across multiple scenes. At the moment my game consists of 3 scenes: menu, game and game over. I want to use the SKEmitterNode in the background across all 3 scenes without any stops. Any help would be much appreciated, thanks!I have a new game I've just started building in