Will restricting background data for play services prevent it from auto updating?

Hello!

I don't know how I missed the function "restrict app background data" but anyhow, if I restrict background data for Google Play Services will it prevent it from auto updating when not on wi-fi? Or is the update triggered by something else e.g. Android OS? Android OS is the only thing available under Data Usage which you can't restrict background data for and if that's the source for Play Services updates it makes disabling background data pointless.

Please don't ask why I want to prevent auto updates, it is irrelevant. Thanks!