At Control Panel > File Services > SMB/AFP/NFS, you can enable AFP service to make DiskStation a Mac file server (AFP server).
Checking this option enables logging of file access operations, including creating, deleting, reading, writing, moving, and renaming files or folders via AFP, also known as Apple Filing Protocol.
Enabling this option applies the default UNIX permissions when uploading or creating files and folders. Applied permissions are the same as permissions applied by the UNIX command umask. When this option is enabled, UNIX permissions are 644 for files and 755 for folders. When this option is disabled, UNIX permissions are 666 for files and 777 for folders. The default umask value is 022.
Enabling this option might cause inconsistent permission issues between different protocols. To avoid inconsistencies, we suggest leaving this option disabled.
Enabling this option immediately releases resources when the AFP server connection unexpectedly disconnects. If you receive "Volume in use" error messages while using Time Machine, please enable this option.
After folders are fully indexed and then mounted on your Mac computer, you can use Finder to search for contents of the contained files.