code: def detect(self, filename, offset, standalone=False):
          
          r = RawStruct(
              filename=filename,
              offset=offset + SIG_OFFSET,
              length=SIG_SIZE)
  
          oem_id = r.data
  
          if oem_id == b"NTFS    ":
              return True
  
          return False
docs: Verifies NTFS filesystem signature.
  
          Returns:
              bool: True if filesystem signature at offset 0x03 \
              matches 'NTFS    ', False otherwise.