you are kidding....right?Pplaying Big Brother on your children is not teaching them or learning them anything. You know what does? Trusting them to more or less follow the boundaries you set for them, not by pressing a button on a phone, but a boundary you're telling, teaching and explaining to them.
That's the real parental control... But again, the horror of actually talking and teaching your kids instead of lazily blaming Apple for not doing it for you.