Seeking recommendation for capacitor to handle high pulse current
Are you familiar with VDD planes and GND planes? Learn and use them. 

For dI/dT of 100 amps in 100 nanoseconds, you need a TOTAL LOOP INDUCTANCE of 1 nanoHenry

Yet inductance of a wire is approximately

1uH/meter * log(1 +  a bunch of stuff)

thus your total length must be only 1milliMeter. Unless you explore planes, and capacitors in parallel, and FET switches in parallel.