[Python] Parse the path directory and file location upto last x paths in pandas

I have a file path location:

file
df = /a/b/c/d/e/f/g/h/i/j/k/l/m/n/a.c
/a/b/c/d/e/x/b.c


I am using the below logic to remove redundant path

df["file"]= df["file"].str.extract(r"(?:/[\w\.-]+){7}/(.+)")


My output is

df = /a/b/c/d/e/f/g/...
/a/b/c/d/e/x/b.c


I am interested to display the file name a.c completely and have output to show the accurate location of a.c with atleast last 3 subdirectory and first few such as 5 subdirectories.

/a/b/c/d/..../l/m/n/a.c


How can we parse correctly ?

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