A filter used to find all family symbols of the given family. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2011 
Syntax
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Remarks
This filter is a quick filter. Quick filters operate only on the ElementRecord, a low-memory class which has a limited interface to read element properties. Elements which are rejected by a quick filter will not be expanded in memory.
Note that it may be faster to get a list of symbol ids from GetFamilySymbolIds rather than to iterate all of the contents of a document with this filter applied.
Inheritance Hierarchy
  System Object  
Autodesk.Revit.DB ElementFilter
Autodesk.Revit.DB ElementQuickFilter
Autodesk.Revit.DB FamilySymbolFilter
 
 Autodesk.Revit.DB ElementFilter
Autodesk.Revit.DB ElementQuickFilter
Autodesk.Revit.DB FamilySymbolFilter