esd protection of power supply line
Normally the capacitance alone is enough to protect the power lines.  Even a 0.1 uF cap will absorb most of the zap.  If you want to make extra sure, use the PI filter.  Unfortunately, odds are high that you'll have issues on your other lines long before you have issues with ESD getting on your power.  Start by filtering/protecting your MCU's reset line, even if it doesn't go over a cable.