@Samuele94 whenever I see someone ask this I cringe. It is the wrong way to build a WiFi network. While you might be able to put 100 clients onto a single access point it will result in crappy performance, as the bandwidth will be divided between too many users.
IMHO, if you want great performance with lots of bandwidth, aim for 10 to 15 users. If you want a good experience then maybe 20 users. If your bandwidth expectations are low (such as basic web browsing, email) then 30 to 50 users.
Over 50 users - well make sure you have very low expectations of performance.
And this has nothing to do with the AP. It's do do with the RF spectrum. You can only carve up a single channel so many ways and leave enough for each individual user to make it work nicely.