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Thanks, didn't know that. For other people the path was Settings -> Data Usage -> Data Usage Control for me.

Which manufacturer? ASUS?

My Motorola Moto G4 Play has Android 6.0.1 too and the only option present is to restrict background data.

OnePlus (3T) for me. (on the Data Usage page it was the small dots menu button in the top right hand corner.)

I also have a G4 Play. I recommend installing LineageOS on it, rooting it, and installing AFWall, which allows setting app-granular networking permissions for WiFi, VPN, and cellular.

Mine is a OnePlus 2 device.

It works.