For me it works,i tested just now.Restart your router,mac and atv4 and try again.Maybe it fixed. Sorry but i don't know something else. For me with 10.11.4 public beta it works.I can see the smb share from my mac to atv4 with vlc 1.0.1 with all the files inside the folder of my movies (i have covers...
I have time capsule 3TB hard disk not the latest model.Before update it was empty folder for me too.With 1.0.1 it works now.I don't know how to help.
You have enable Guest access with airport utility to time capsule?
With version 1.0.1 i can connect now with smb to time capsule disk.
User:Guest
Password: i leave empty
after Save and connect to time capsule disk and can see all the folders and play video files.