Apple - Disabling Voice Control, or at least muting it (iOS 10)

As of iOS 10.2.1 (maybe as early as 10.2), it is possible to disable Voice Control.

Settings > General > Accessibility > Home Button

There is a setting PRESS AND HOLD TO SPEAK. Set this to Off. The descriptive text is "There will be no response when you press and hold the Home button."

I would like to thank Bob Briscoe for providing this answer, which he received from Apple Support. Since the question is protected, he cannot post an answer himself, so I am posting on his behalf.

There seems to be no way to disable it under iOS 10.