CUSTESC-48297 - clarify available filters depends on node

Prevent for CUSTESC-48297.
Feel free to reword/adjust as long we can get the point of across.

Author: cf-matthias

src/content/docs/analytics/graphql-api/features/filtering.mdx

@@ -18,6 +18,8 @@ You can use filters as an argument on the following resources:
 * accounts
 * tables (datasets)
 
+Which filters are available depends on the queried node. For example, some nodes may only support a zoneTag filter, some only an accountTag filter, and some may allow both.
+
 ### Zone filter
 
 Allows querying zone-related data by zone ID (`zoneTag`).