Hi,
error(13): Permission denied Refer to the mount.cifs(8) manual page
Guest Access: ON
So guest access is not enabled on your share.
Try this as settings on your AE:
Server Type: SMB
Name: the server name you like
Username: Guest
Password: (blank)
Workgroup: WORKGROUP
Or try to use a user and password (has to be configured on your Airport)
You also can try to add
vers=2.0
to the mount options.
Frank