In SharePoint, if we have large folder hierarchy in list/library (i.e. more than 10 sub levels) and we have added list view web part of that list/library in wiki page then it’s very difficult for end users to navigate through each folder level. Secondly, user can never know in which folder currently he/she is. Thirdly, If user want to navigate up more than one level then it's very hard too.
Suppose we have one document library say ‘Training Material’ with below folder structure.
Here is a simple script which you can put in a content editor web part on the same wiki page to get rid from all above difficulties.