Nothing upstream of your electrical panel is sensitive enough to save you the way GFCI outlets are intended to. They aren't even sensitive enough to tell if you

Nothing upstream of your electrical panel is sensitive enough to save you the way GFCI outlets are intended to. They aren't even sensitive enough to tell if your whole house is going up because of an electrical fire, they're there for downed power lines etc you getting zapped in the tub is barely a blip to those protection systems.