for shielding, conduit from the breaker panel, to steel boxes, run a separate ground wire, don't count on the conduit to conduct if you need safety ground. the conduit will shield the power leads.
as mentioned above, it does diddly-squat for lightning-induced currents. code says if this is a subpanel, run safety ground to your lightning rod(s) and back to the ground buss in your main entrance panel. that helps in case of a near strike on the block.
you have to do serious work to mitigate and dissipate a direct hit. check the Polyphaser website for ideas. a grounded antenna switch inside still lets the big juice inside. best to attenuate and dissipate it outside with a big plate to ground, with adequate conductor size to not vaporize under thousands of amps and millions of volts, lots of suppressors, and let it burn up the outside stuff. I even have my roof stands direct to ground. stuff is going to die hard and fast. let it happen outside.