Do Macs Play FLAC?

My my understanding was always that they could not play FLAC encoded files.  I just installed a Synology NAS.  I have a Bluesound Vault 2 with about 300 CDs that were ripped in FLAC and was able to transfer the contents of the Vault 2 to the NAS.  These show up as FLAC files in the NAS index.  To my surprise, they play on my MAcAir, purchased in in 2013, via usb into a Bryston DAC3.  I had assumed I would need a music playing program to make these files playable on the Mac.  I have no FLAC converting software loaded onto the Mac