Directory.CreateDirectory() for a file path while ignoring the filename

I have a file with full path

/path/to/some/very/long/file.txt

/path/to/some/very/long/file.txt

. I would like to be able to use

Directory.CreateDirectory(path)

Directory.CreateDirectory(path)

to create all folders and subfolders on the way to that file, but in practice, it ends up creating a

file.txt

file.txt

folder at the end. Is there a more elegant solution to this other than splitting my path string on

and reforming it minus the last piece?