How can I check to see the permissions (read/write/execute) that a running node.js process has on a given file?

I was hoping that the fs.Stats object had some information about permissions but I don't see any. Is there some built-in function that will allow me to do such checks? For example:

var filename = '/path/to/some/file';
if (fs.canRead(filename)) // OK...
if (fs.canWrite(filename)) // OK...
if (fs.canExecute(filename)) // OK...

Surely I don't have to attempt to open the file in each of those modes and handle an error as the negative affirmation, right? There's got to be a simpler way...

file node.js permissions
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