May I know if TerarkFS support is done and can be tested?

## [BUG]
### Expected behavior

### Actual behavior

### Steps to reproduce the behavior

## [Enhancement]
ask for status about TerarkFS
### Problem
TerarkFS is good feature that can talk the disk directly with thin File system alike management layer. combined with db_paths feature, we do not need implement very complex file system.
### Solution
