Extracted from their own GitHub issues tickets :
Here is an example to lock folder and subfolder write / delete
array(
'pattern' => '/.(lockedFolder1|lockedFolder2)/',
// Dont write or delete to this and all subfolders
'read' => true,
'write' => false,
'locked' => true
)
Here is an example to lock root but not subfolders :
array(
'pattern' => '/.(lockedFolder1|lockedFolder2)$/',
// Dont write or delete to this but subfolders and files
'read' => true,
'write' => false,
'locked' => true
)