System.cmd not returning expected result

gistfile1.txt

~/dev/$ docker ps -a -q --filter "name=build_environment"
b6bc93894233

iex(49)> :os.cmd(String.to_char_list("docker ps -a -q --filter \"name=build_environment\""))
'b6bc93894233\n'

iex(50)> System.cmd("docker", ["ps", "-a", "-q", "--filter", "\"name=build_environment\""])    
{"b6bc93894233\n55a77d7dbbd6\n3a5d4c0e317e\ndaed62533b44\na9a21d999a22\nf84b6ecd4744\nd510d0839be6\nd0ad26628d78\nb67fda5e09f1\n02741d8990d7\n5b053bfcd774\n11b791e316db\nb7b37bd15bb1\n2233b1cb2c1e\n660278b07c79\n366dbfc2dcf3\n5cb38e10ac35\n9203065c641e\n9df8469bc205\n07a04ec2631b\nee2f5aa6f994\n38763c699a56\n562491df7082\na84f932fc9d4\n5fc4ac7f9a97\ndf7fcb6c14f9\nae665a3123b7\n9499980a188c\n015fe24ae620\n25eab5269448\n0abd0606a280\n6ba6753a0d3a\nc07b50ba4afa\nc62bb89936ca\naeab78fedc5f\nb05a4a95026b\n01707f07aeb9\n9fa5a9268c1c\n8aeea2438284\n1d3a0f49bb69\n615091e8b1c2\n5e060bba3036\n620c2c799ba9\n0bc40a5c2e53\n363fd37f2ca3\n0a27376d816c\n36c4e7c3fc46\n6db0ace85f83\n077a91d06078\n980df8eb6eb6\nc411756633d2\n24c7e3044f03\n35aed2cc0a47\n7713f20b6485\n273024cea120\nbf7343e2b2d9\n5e4fdc876584\n8a732e58f10a\nfe715a934db8\na38e048ad227\n1f34478fca47\neefa4de2623c\n95fb3a558941\n51e03297df74\n76a5ba269bf2\n47a5b2e6f696\n83b49b3d6bb7\n44de44354e9f\nf864959f8c3c\n111a0bfb59f7\n4577d239e069\na113de4ce155\n9302bb66897e\n202c693c90f8\n9825691b8f9a\nac815ae2af78\na5fa4ad34d7a\n51fe2f58cccc\n7c6398b0b29f\n",
 0}
 
# The result from the System.cmd/3 call is incorrect.