OH MY GOD!!! 
I feel sooooo awesome right now!!!
I sat down with this problem now for 4 hours without any breaks and FINALLY I managed to figure out what was causing all this madness!!!
The reason why my folders (inside my shares) didn’t show any subfolders is because a while ago I decided to change the icon on the folders inside my private share. So for the “pictures” folder I used the macs own picture folder icon and same goes for the video, music etc. folders.
How did I solve my problem? I just removed the icons and set it to the default one, tried again on my iphone and it now works as it should be!!! Wooohooooo!!! :D
… You all know that feel when you struggle with a technical issue and you finally manage to solve it, by yourself!! 
