The key in a file system attribute dictionary dictionary whose value indicates the number of free nodes in the file system.
The corresponding value is an NSNumber object that specifies the number of free nodes in the file system.
Available in Mac OS X v10.0 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)