"Date Created" changes on every save with QNAP NAS

We are using a QNAP NAS for network file storage. Every time I save a file the Date Created is updated to the current time. This only seems to happen with Rhino5/Rhino6. I can create a text file (.txt), then modify it and the Date Created does not change. Is there a way to correct this? It works fine on windows (NTFS) but not on NAS (EXT4).