To search for a file or folder from a File Reference Number (FRN) use the frn: search function.
For example, to find the root folders of NTFS volumes, search for:
frn:0x0005000000000005
For example, to find the NTFS file with FRN 0x00100000000966d8, search for:
frn:0x00100000000966d8
For example, to find the root folders of ReFS v3 volumes, search for:
frn:0x00000000000006000000000000000000
FRNs can be represented in decimal or hexadecimal.
The frn: search function requires Everything 845b or later.