Simple:
PS C:\> Get-NaSnapshot -TargetName vol2
Name Created Total Cumulative Dependency
---- ------- ----- ---------- ----------
{1670257f-602b-4cf8-ac8a-b94e21486c95} 4/21/2009 53.5 GB 64.5 GB busy,LUNs,vclone
benson(0118045471)_dunn_vol2_mirror.377 3/20/2012 84.6 MB 84.6 MB snapmirror
cg_snapshot 6/27/2010 48.0 MB 11.0 GB
clone_vol2clone.1 9/17/2010 6.7 GB 10.9 GB
clone_vol2clone.2 10/19/2010 1.5 GB 4.2 GB busy,vclone
goldenBackup 3/11/2011 2.7 GB 2.7 GB