@Taftus No you can't enter the genesis folder! It isn't createted in filesystem.
You can follow path to megadrive folder because it's just linked to it - but this are only subtleties.

if you type ls -l you will see

drwxr-xr-x 2 pi pi 4096 Aug 19 2016 gba drwxr-xr-x 2 pi pi 4096 Aug 19 2016 gbc lrwxrwxrwx 1 root root 9 Aug 19 2016 genesis -> megadrive drwxr-xr-x 3 pi pi 4096 Aug 19 2016 mame-libretro