How to use ScaleIO Snapshot to roll back

In the ScaleIO User Guide, teaching me how to create, map and remove a Snapshot. But how could I use ScaleIO Snapshot volume to roll back?Thank all guys first.

Here is the volume that i define in ScaleIO system.

ScaleIO-10-204-28-174:~ # scli --query_all_volume

Query-all-volumes returned 2 volumes

Protection Domain db363f5b00000000 Name: Storage

Storage Pool 6290843500000000 Name: HDD

Volume ID: 4b8f428100000000 Name: ScaleIO_Volume_1 Size: 304.0 GB (311296 MB) Mapped to all SDC Thick-provisioned

Volume ID: 4b8f428200000001 Name: SIO_Snap_1 Size: 304.0 GB (311296 MB) Mapped to all SDC Snapshot of ScaleIO_Volume_1