Fractals give the same amount of influence as dungeons (10 inf for 1-2 guild members, 100 inf for 3-5 guild members).
They do not receive the bonus influence from the 20% dungeon buff which could be understandable since they don’t show up as dungeons on the influence tracker.
They don’t even receive the bonus influence from the 5% influence buff though.
If people want to know how to see your fractal influence, you have to take the total number of activities and influence gained and subtract the number of dungeons, events, gifts, and pvp matches. The remaining amount is from Fractals.