Why can't I control pop up notifications on my Meizu?

Android 6.0 has the option of controlling whether specific apps can or cannot display pop-up notifications on your screen. However, on my meizu phone, I can ONLY control allow or block all notifications altogether. I wish to allow whatsapp notifications on my phone, but block all its pop-up notifications. Unfortunately, this cannot be done from the app itself and must be done from the phone settings. I just purchased my Meizu phone and if this cannot be achieved with it I will regret my purhcase. Any solution? Many thanks. 

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