Should I mop or sanitize subfloor prior to flooring install?
You should not mop, and you should not worry about it. The entirety of your subfloor is organic. Mopping will only create an actual problem--moisture soaked into your subfloor.
If you saw what carpet and other flooring typically goes over after a new build or remodel you'd realize that your concerns are unfounded. Vacuum well to prevent dust creep later and carry on.