Create Patch file of all modified contents including unversioned files/folders

SVNKit
#1

Unlike in TortoiseSVN, can we create a patch of all files/folders INCLUDING UNVERSIONED files?

Tried doDiff and doExport methods to get all modified files with its contents. But below methods works only for versioned files.

clientManager.getDiffClient().doDiff(files, SVNRevision.UNDEFINED, SVNRevision.WORKING, SVNRevision.HEAD, SVNDepth.INFINITY, true, System.out, fileNames);

Is there any way to export/create-patch of all modified files using SVNKit?