fix: ZFSPath, Dataset hash

zfs_backup.py

@@ -215,6 +215,9 @@ class ZFSPath:
             and self._snapshot_name == other._snapshot_name
         )
 
+    def __hash__(self):
+        return str(self).__hash__()
+
     @classmethod
     def from_string(cls, string: str) -> ZFSPath:
         """Take a string from the `zfs` cli, return a ZFSPath object."""
@@ -691,6 +694,9 @@ class Dataset:
     def __eq__(self, other: Dataset):
         return self._path == other._path
 
+    def __hash__(self):
+        return self._path.__hash__()
+
     @classmethod
     def from_string(cls, qualified_name: str) -> Dataset:
         return cls(ZFSPath.from_string(qualified_name))