GV$ASM_ACFSSNAPSHOTS definition in Oracle Database 11.2
GV$ASM_ACFSSNAPSHOTS

select
  xv.inst_id,                              -- INST_ID NUMBER
  xv.name_kfvacfss,                        -- FS_NAME VARCHAR2(1024)
  xv.voldev_kfvacfss,                      -- VOL_DEVICE VARCHAR2(256)
  xv.sname_kfvacfss,                       -- SNAP_NAME VARCHAR2(1024)
  to_date(                                 -- CREATE_TIME DATE
    xv.time_kfvacfss,'MM/DD/RR HH24:MI:SS','NLS_CALENDAR=Gregorian') 
from
  x$kfvacfss xv

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