Delay of one second when deleting file using different name case

[ericzolf]

I've described exactly what I mean in rdiff-backup/rdiff-backup#38 (comment) but in short: if you create a file under one name, delete it using a different case, then check it using the first name, there is a lag of 1 second before it's recognized as having been deleted.

With an example touch A; rm a; stat A does not fail unless there is a delay of one full second between deletion and validation. On the other hand, touch a; stat A doesn't fail, so there isn't the same lag.

We're using the approach to check if the file system is case sensitive or not, and would appreciate a way to do it without having to wait for 1sec.