(X100) What is the maximum shutter speed at F5.6 F4 F2.8 F2?

I need some information about X100.

The following is technical specification of X100.

http://www.finepix-x100.com/en/x100/technical-specification

Shutter speed (with mechanical shutter)
(P mode) 1/4 sec. to 1/4000* sec., (All other modes) 30 sec. to 1/4000* sec.
Bulb (max. 60min.)
1/4000sec at F8 or smaller aperture

There is some vagueness in the specification of X100.

It says 1/4000 sec is limited to F8 or smaller aperture.

Then what is the maximum shutter speed at F5.6 F4 F2.8 F2?

BTW I have seen that maximum shutter speed at F2 is 1/1000 sec.

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