Did you tried to create Superuser(s) ?

Superuser is a user who has the permission to take ownership of folders and files belonging to other users. These rights can be useful when an administrator wants to change access rights (ACL) for folders or files created by other users. To give superuser privileges to a user, select them in the menu. Superuser privileges allow modifying, removing and adding new files to the share. This includes all files and directories, even those the superuser does not have ownership of.