First, there are no stupid questions imo only stupid answers, to answer your question is more difficult, and some may correct me, but here it goes
those 911 and 100 trades are mm's toying around, some call it signaling, but i in my 8 years of trading have never had a partial fill of 911 or 100. The only thing that happens is that i get a partial fill of 5000 or more shares before an uptick.
One can never tell by looking at level 2 if a trade is a buy or a sell, just by looking at the bid / ask price, u can get your shares on the bid or you can buy them on ask, same with selling u can sell at the ask (clever) or at bid (then u are a whacker).
Volume can be an indicator but never tells
a) the true amount of shares being bought (when pps rises dramatically u assume there are a lot of buyers: mostly correct)
b) the true amount of shares being sold ( volume is huge but no price change could mean a lot of selling at the ask or dilution or big apple selling share lol)
I hope i clarified at least some of the questions, in this case of 0.0001 stocks, one never knows how many shares there are left at 0.0001, never underestimate the power of the mm's, Ant.