to-directory-tree: Create parents of files when using fixpoint directory tree representation
#909
| Job | Run time |
|---|---|
| 9m 31s | |
| 6m 3s | |
| 33m 24s | |
| 5m 26s | |
| 5m 13s | |
| 6m 6s | |
| 4m 50s | |
| 4m 37s | |
| 1h 15m 10s |