user-dirs.dirs is in perfect condition. But I included every non-specific subfolder of MyDocs to "NOT to crawl" key of tracker-miner-fs.cfg
Including /home/user/MyDocs/Downloads.

So this is why I can't share files from this folders. When I creating new MyDocs subfolder and trying to share random file from it - everything goes alright. But if I add it to "NOT to crawl" and update tracker database, I can't share a thing.