Ignore non-`.parquet` (suffixed) paths for now during tsdb fs-indexing

piker/storage/nativedb.py

@@ -161,7 +161,12 @@ class NativeStorageClient:
 
     def index_files(self):
         for path in self._datadir.iterdir():
-            if path.name in {'borked', 'expired',}:
+            if (
+                path.name in {'borked', 'expired',}
+                or
+                '.parquet' not in str(path)
+            ):
+                # ignore all non-apache files (for now)
                 continue
 
             key: str = path.name.rstrip('.parquet')