Search API with ViPR REST

There are serveral REST commands that fall under this category, but referring to the API referrence I can't see how to use this.

For example,

Search

GET /file/filesystems/search

Search resources by name, tag, project or additional parameters (for example, wwn or initiator_port etc.)

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what is the syntax for passing values to be searched and where can I find valid names?

I have tried the command with no parameters, but that fails.

e.g.

https://servername:4443/file/filesystems/search?using-cookies

But the resppnse to that is .

"Parameter for com.emc.storageos.db.client.model.FileShare search is incorrect, at least one of tag, name, project or mountPath is required"