If you enable group filters in your export, that won't have any effect on cloth being exported (only potentially the underlying cloth driver particles). Cloths themselves do not have group assignments (the groups applied to underlying cloth driver particles do not affect cloth or cloth export).
A workaround which would allow you to split up cloth after export would be to assign material IDs to cloths (different IDs per cloth), then use a tySelect in combination with a DeleteMesh modifier to split up cloth caches, select parts you need or don't need, then delete the rest.
A workaround which would allow you to split up cloth after export would be to assign material IDs to cloths (different IDs per cloth), then use a tySelect in combination with a DeleteMesh modifier to split up cloth caches, select parts you need or don't need, then delete the rest.