Remove root commit using git filter-branch

How to :

• find out commit ID of the root
• use git filter-branch using –parent-filter and a sed command that snips off that parent. git filter-branch --parent-filter "sed 's/-p <the_commit>//'" HEAD

Notes: all files on old root commit will be moved to new root commit.

Source: https://stackoverflow.com/questions/6149520/git-remove-root-commit