FTL is a Star Alliance Silver level status.

This level neither grants you Gold track (= priority security + priority immigration) nor priority boarding.

M&M does give FTLs priority security at a few airports (mostly in the member countries of M&M airlines). But it's no benefit promised or guaranteed to FTLs (and not to *A Silver, either).

More or less the same goes for priority boarding. It's not an FTL benefit. Airports which grant FTL priority boarding are very much the exception rather than the rule.