If the order doesn't matter, you could sucessively chop off stuff from the end. This prints the same as your code, but reversed:
my $_=$a; say while s|[^/]+/*$||;
But if order does matter (e.g. for mkdir purposes), you can of course also say
my $_=$a; push @dirs, $_ while s|[^/]+/*$||;
say for reverse @dirs;
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