Well, I can say that this doesn't really make much sense to me... I mean, the fact that the System Volume Information content cannot even be enumerated certainly means that it won't be scanned (let's put aside the reason why for now) - but the percentage certainly shouldn't "jump" here, because even the estimation wouldn't know about the files inside...
Anyway, I'd be interested in the "ashQuick" scan of the System Volume Information folder only (the File Monitor log), as I wrote in my original post... it's rather unnecessary to scan the whole drive using Simple UI,,,