Documentation on how to do point in time restore for a replicaset using mongodump is missing
The case is:

• I have a filesystem snapshot from time 1
• something bad happens at time 3
• my oplog cover operations starting from time 0

I can perform a point in time restore:

1. dump the current oplog (mongodump -d local -c oplog.rs)
2. mv dump/local/oplog.rs.bson dump/oplog.bson
3. rm -rf dump/local
4. mongorestore --oplogReplay --oplogLimit=<seconds>

Step 1 can be optimized in order to dump only the interested time range using mongodump option

--query { "ts" : { "$gte" : start_sec }, "ts" : { "$lte" : end_sec } }