We have 1278 paid games that are included and 55 that are excluded from family sharing. Seemed to be mostly ubi, rockstar and ea games. Games that you claimed while they had a limited 100% discount are also excluded. The last few are live-service or mmo games.
"Family sharing" is now a feature listed on every store page. Same place as singleplayer, trading cards, cloud saves and similar. As far as I know no major changes has happened in which games support it, but that may change now that sharing gets more attention.
It's the town that's 80% black, not the mayor. Which is then put in contrast with the majority white town leadership.