Hi Miler,
If you are still looking for the solution and if PowerShell is an option than you can simply connect to that storage system & issue following cmdlet:
PS C:\> Get-NaSnapshot <vol_name>
Name Created Total Cumulative Dependency
---- ------- ----- ---------- ----------
fas-sim-2(0099931872)_sv_dst_sv_dst_non_qt... 9/14/2011 44.0 KB 448.0 KB snapvault
fas-sim-2(0099931872)_sv_dst_sv_qt1-src.0 9/14/2011 44.0 KB 536.0 KB snapvault
fas-sim-2(0099931872)_sv_dst_sv_qt2-src.0 9/14/2011 44.0 KB 492.0 KB snapvault
hourly.0 9/19/2011 40.0 KB 40.0 KB
hourly.1 9/18/2011 52.0 KB 144.0 KB
hourly.2 9/18/2011 52.0 KB 196.0 KB
hourly.3 9/18/2011 52.0 KB 248.0 KB
hourly.4 9/18/2011 52.0 KB 300.0 KB
hourly.5 9/17/2011 52.0 KB 404.0 KB
nightly.0 9/19/2011 52.0 KB 92.0 KB
nightly.1 9/18/2011 52.0 KB 352.0 KB