How to find out if a WFS instance supports filtering via CQL?

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I am considering using Common Query Language (CQL) to add filter parameter to a HTTP curl query which runs against a WFS server. I found out that GeoServer supports CQL via WFS.

1. Can I tell from a GetCapabilities document if the WFS is served by GeoServer?
2. How can I test if CQL is supported by the WFS?

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