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@@ -21,12 +21,20 @@ Do not prompt for confirmation.
#### **--filter**
-Filter volumes to be pruned. Volumes can be filtered by the following attributes:
+Provide filter values.
-| **Filter** | **Description** |
-| ---------- | ------------------------------------------------------------------------------------- |
-| label | [Key] or [Key=Value] Label assigned to a volume |
-| until | Only remove volumes created before given timestamp |
+The *filters* argument format is of `key=value`. If there is more than one *filter*, then pass multiple OPTIONS: **--filter** *foo=bar* **--filter** *bif=baz*.
+
+Supported filters:
+
+| Filter | Description |
+| :----------------: | --------------------------------------------------------------------------- |
+| *until* | Only remove volumes created before given timestamp. |
+| *label* | Only remove volumes, with (or without, in the case of label!=[...] is used) the specified labels. |
+
+The `until` *filter* can be Unix timestamps, date formatted timestamps, or Go duration strings (e.g. 10m, 1h30m) computed relative to the machine’s time.
+
+The `label` *filter* accepts two formats. One is the `label`=*key* or `label`=*key*=*value*, which removes volumes with the specified labels. The other format is the `label!`=*key* or `label!`=*key*=*value*, which removes volumes without the specified labels.
#### **--help**