How can I reverse lookup an alias, ie. find what links to a file or folder?

Suppose I have a folder /my/dir/ and an alias in ~/Documents (called thisdir) pointing to /my/dir/. How can I find the alias (ie. find all aliases) that points to /my/dir/? This question is **unlike** a seemingly similar question on Ask Different , which asks for how to find where an alias points to (even with deleted files). To the careful reader, this questions however asks for the reverse: /my/dir/ points to ~/Documents/thisdir, ie. the dir/ in /my/dir/ is an alias pointing to ~/Documents/thisdir. **I want to know how I can find out what points to thisdir, if I don't know /my/dir/.**