Trying again...
(contrived example with made-up mount option --overlay)
mkdir a
echo "a/x" > a/x
echo "a/y" > a/y
echo "a/z" > a/z
mkdir b
echo "b/y" > b/y
mkdir c
echo "c/z" > c/z
mkdir d
mount --bind a d
mount --bind --overlay b d
mount --bind --overlay c d
cat d/x
"a/x"
cat d/y
"b/y"
cat d/z
"c/z"
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