Try https://play.google.com/store/apps/details?id=com.wa2c.android.cifsdocumentsprovider&hl=en&gl=US
This works as plugin and the smb/cifs shares are available via Poweramp Music Folders selection:
- configure share within CIFS Document Provider as needed
- in Poweramp Settings / Library / Music Folders - press Add Folder Or Storage button
- use side menu / select CIFS Documents Provider
If you have large library on the network device or network is rather slow, keep Poweramp open or playing to allow scan progress to finish.