I found the question and answer Eclipse :: Hide .svn files in Open Resource dialog but don\'t want to filter all resources with a given name say \'work\', which is to general. I
Beware trailing slashes when you want to filter out an entire folder, ie. use
path/to/exclude
not
path/to/exclude/
Found a solution with the settings:
Now all subfiles and subdirectories below this are excluded.