Output newly created git_filter_list (or null)
Repository object that contains path
The blob to which the filter will be applied (if known)
Relative path of the file to be filtered
Filtering direction (WT->ODB or ODB->WT)
Combination of git_filter_flag_t flags
0 on success (which could still return null if no filters are needed for the requested file), <0 on error
Load the filter list for a given path.
This will return 0 (success) but set the output git_filter_list to null if no filters are requested for the given file.