Native Celerra file system deduplication ? It's file level dedupe only

https://support.emc.com/docu10573_Using-Celerra-Data-Deduplication.pdf?language=en_US

Doesnt make sense

NS-120 line has file-level deduplication – which means single-instancing files and compressing files

Compressing a VHD file that changes frequently doesn’t make sense

Please see the Celerra / VNX file deduplication white paper