Best Practice for Shielding All Wires or Only Signal Wires on 4-Pin CAM Hall Sensor?

Hi,
Was just playing with the thought of shielding CAM-sensors (automotive hall sensor). Say you would have a 4-pin CAM sensor with the normal wiring: VCC, GND, Signal 1 & Signal 2. 

In this case would it be prefered to only shield signal 1 and signal 2, or to shield all 4 cables in the same shield?

My reasoning for shielding only signal 1 & signal 2 would be to remove the constant magnetic field from the VCC & GND (even though they should cancel out each other). On the other hand you might pick up disturbances from the VCC & GND cables if you do not shield those as well depending on the electronics inside the sensor.

What do you think is the best way here? Is there a general approach?

When shielding sensors, you need to think about what you want to shield against and what you will connect the shield to (and on which end or both)
In general it's easier to get shielded cable that would shield all four wires and it would be typical to have the shield connect to ground. There are occasions where your sensor ground is not the same as the ground you want to use for shielding so you need to think about that as well.