Symantec Data Loss Prevention (DLP)
When scanning DFS, the DLP Discover scan does not preserve the last accessed date.
The last access date preservation is only available with JCIF's and CIF's shares, not currently available with DFS
Data Loss Prevention (DLP) any version
Currently working as designed, only scans of JCIF and CIF shares preserve the last access date.
For information on how to modify the last access date on JCIF and CIF shares refer to: How to modify the Last Access Date in Discover Scan